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The initial investment is somewhat high - perhaps $150-180 US for an initial setup. In addition, the kegging system works best if you have a suitable refrigerator, usually a second one to store the keg in.

Almost all home brewers use the Cornelius kegging system, which uses 2.5 to 5 gallon Cornelius kegs to store the beer in. Cornelius kegs are the same kegs used for many years for dispensing soda, so they are also frequently called soda kegs. Since most soda distributors have converted to a bag-in-box system there are literally millions of used Cornelius kegs available on the market at very reasonable prices of around $20-30 per keg. The most popular size is the5 gallons.